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Expected Positive Exposure. The Expected Positive Exposure (EPE) is the weighted average over time of the expected exposure, where the weights are the proportion that an individual expected exposure represents of the entire exposure horizon time interval [1]. The EPE can be calculated as.
Share. By Anne Marie Helmenstine, Ph.D. Definition: The permissible exposure limit (PEL) is the time-weighted average threshold limit a person working an 8 hour shift can be exposed to a chemical without suffering ill effects. This value is used in the United States by OSHA to protect workers in hazardous conditions.y Anne Marie Helmenstine, Ph.D. Definition: The permissible exposure limit (PEL) is the time-weighted average threshold limit a person working an 8 hour shift can be exposed to a chemical without suffering ill effects.